Some guy proposed to his girlfriend by spelling out 'LISA WILL YOU MARRY ME?' in coins in a Super Mario World level he edited. This is the video of Lisa playing the game and accepting his proposal.

My nerdy way to propose. On October 15th 2009, it was out 5 year anniversary so i decided to propose. Using a program called lunar magic I was able to spell "lisa... Will you marry me?" she may not look too surprised in the video but you should of seen her afterwords, she couldn't sit still!!! And no it wasn't staged, but I did sit her down told her to play some Super Mario World, but she totally didn't know she was being recorded!!

Cute! This gives me a great idea about how I'm going to propose. By never asking. What do you think -- too romantic?